/* SPDX-License-Identifier: GPL-2.0 */

#ifndef ELF_LOADER_H
#define ELF_LOADER_H

#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>
#include <string.h>
#include <types.h>

#include <elf.h>

static inline u8 fw_elf_get_class(u32 elf_fw_addr)
{
	struct elf32_hdr *ehdr = (struct elf32_hdr *)elf_fw_addr;

	return ehdr->e_ident[EI_CLASS];
}

static inline void elf_hdr_init_ident(struct elf32_hdr *hdr, u8 class)
{
	memcpy(hdr->e_ident, ELFMAG, SELFMAG);
	hdr->e_ident[EI_CLASS] = class;
	hdr->e_ident[EI_DATA] = ELFDATA2LSB;
	hdr->e_ident[EI_VERSION] = EV_CURRENT;
	hdr->e_ident[EI_OSABI] = ELFOSABI_NONE;
}

/* Generate getter and setter for a specific elf struct/field */
#define ELF_GEN_FIELD_GET_SET(__s, __field, __type)                           \
	static inline __type elf_##__s##_get_##__field(u8 class,              \
						       const void *arg)       \
	{                                                                     \
		if (class == ELFCLASS32)                                      \
			return (__type)((const struct elf32_##__s *)arg)      \
				->__field;                                    \
		else                                                          \
			return (__type)((const struct elf64_##__s *)arg)      \
				->__field;                                    \
	}                                                                     \
	static inline void elf_##__s##_set_##__field(u8 class, void *arg,     \
						     __type value)            \
	{                                                                     \
		if (class == ELFCLASS32)                                      \
			((struct elf32_##__s *)arg)->__field = (__type)value; \
		else                                                          \
			((struct elf64_##__s *)arg)->__field = (__type)value; \
	}

ELF_GEN_FIELD_GET_SET(hdr, e_entry, u64)
ELF_GEN_FIELD_GET_SET(hdr, e_phnum, u16)
ELF_GEN_FIELD_GET_SET(hdr, e_shnum, u16)
ELF_GEN_FIELD_GET_SET(hdr, e_phoff, u64)
ELF_GEN_FIELD_GET_SET(hdr, e_shoff, u64)
ELF_GEN_FIELD_GET_SET(hdr, e_shstrndx, u16)
ELF_GEN_FIELD_GET_SET(hdr, e_machine, u16)
ELF_GEN_FIELD_GET_SET(hdr, e_type, u16)
ELF_GEN_FIELD_GET_SET(hdr, e_version, u32)
ELF_GEN_FIELD_GET_SET(hdr, e_ehsize, u32)
ELF_GEN_FIELD_GET_SET(hdr, e_phentsize, u16)
ELF_GEN_FIELD_GET_SET(hdr, e_shentsize, u16)

ELF_GEN_FIELD_GET_SET(phdr, p_paddr, u64)
ELF_GEN_FIELD_GET_SET(phdr, p_vaddr, u64)
ELF_GEN_FIELD_GET_SET(phdr, p_filesz, u64)
ELF_GEN_FIELD_GET_SET(phdr, p_memsz, u64)
ELF_GEN_FIELD_GET_SET(phdr, p_type, u32)
ELF_GEN_FIELD_GET_SET(phdr, p_offset, u64)
ELF_GEN_FIELD_GET_SET(phdr, p_flags, u32)
ELF_GEN_FIELD_GET_SET(phdr, p_align, u64)

ELF_GEN_FIELD_GET_SET(shdr, sh_type, u32)
ELF_GEN_FIELD_GET_SET(shdr, sh_flags, u32)
ELF_GEN_FIELD_GET_SET(shdr, sh_entsize, u16)
ELF_GEN_FIELD_GET_SET(shdr, sh_size, u64)
ELF_GEN_FIELD_GET_SET(shdr, sh_offset, u64)
ELF_GEN_FIELD_GET_SET(shdr, sh_name, u32)
ELF_GEN_FIELD_GET_SET(shdr, sh_addr, u64)

#define ELF_STRUCT_SIZE(__s)                                    \
	static inline unsigned long elf_size_of_##__s(u8 class) \
	{                                                       \
		if (class == ELFCLASS32)                        \
			return sizeof(struct elf32_##__s);      \
		else                                            \
			return sizeof(struct elf64_##__s);      \
	}

ELF_STRUCT_SIZE(shdr)
ELF_STRUCT_SIZE(phdr)
ELF_STRUCT_SIZE(hdr)

#endif /* ELF_LOADER_H */